Compilare: main.cpp: In function 'void gen_hash(long long int)': main.cpp:57:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for (int i=1; i<s[a].size(); i++) | ~^~~~~~~~~~~~ main.cpp: In function 'bool check(long long int)': main.cpp:66:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for (int i=1; i<query.size(); i++) | ~^~~~~~~~~~~~~